Process for synthesis of b-site doped abx3 perovskite nanocrystals

Abstract

The present invention relates to a process for the synthesis of B-site doped ABX 3 perovskite nanocrystals. The process comprises the steps of loading non-halide precursors of A, B, and dopant in three neck flasks along with long chain acid and olefin, purging of the reaction mixture under heating, and finally injection of alkylammonium chloride stock solution in the reaction mixture at a desired temperature. Introducing transition metal such as Mn and other rare earths, etc., as dopants in the perovskite nanocrystals to induce a new optical window.

We claim: 
     
         1 . A process for preparation of D-doped ABX 3  perovskite nanocrystals, the process comprising:
 (a) loading non-halide precursors of A, B and D in a three-neck flask along with a long chain acid and a linear alpha olefin solvent to form a reaction mixture;   (b) purging the reaction mixture with an inert gas at a temperature in a range of 100-160° C. for 30 minutes;   (c) injecting an alkylammonium halide solution in the reaction mixture at a temperature in a range of 80-200° C.;   (d) annealing the reaction mixture for 5 seconds to 1 hour and cooling down naturally; and   (e) precipitating the D-doped ABX 3  nanocrystals.   
     
     
         2 . The process as claimed in  claim 1 , wherein the non-halide precursors A and B are present in a ratio of 1:1. 
     
     
         3 . The process as claimed in  claim 1 , wherein D is present in a range of 5-50 wt. % with respect to A and B. 
     
     
         4 . The process as claimed in  claim 1 , wherein A is selected from cesium (Cs) and formamidinium (FA); B is lead (Pb); and X is selected from chlorine (Cl), bromine (Br) and iodine (I). 
     
     
         5 . The process as claimed in  claim 1 , wherein D is selected from manganese (Mn), nickel (Ni), cobalt (Co), iron (Fe), magnesium (Mg), beryllium (Be), calcium (Ca), strontium (Sr), barium (Ba), bismuth (Bi), antimony (Sb), cerium (Ce), samarium (Sm), europium (Eu), terbium (Tb), dysprosium (Dy), erbium (Er), ytterbium (Yb), zinc (Zn), cadmium (Cd), thallium (Tl), tin (Sn). 
     
     
         6 . The process as claimed in  claim 1 , wherein the non-halide precursor source is selected from carbonate, acetate, nitrate, acetylacetonate, oleate, undecylenate, myristate, laurate, or palmitate. 
     
     
         7 . The process as claimed in  claim 1 , wherein the long chain acid is selected from oleic acid, undecylenic acid, dodecanoic acid, hexadecanoic acid, or hexadecanoic acid. 
     
     
         8 . The process as claimed in  claim 1 , wherein the linear alpha olefin solvent is selected from 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, or 1-octadecene. 
     
     
         9 . The process as claimed in  claim 1 , wherein the alkylammonium halide is selected from chloride or bromide or iodide salts of octylammonium, oleylammonium, dodecylammonium, dodecylamine, dihexylammonium, dioctylammonium, didecylammonium, or dioctdecylammonium. 
     
     
         10 . The process as claimed in  claim 1 , wherein the process comprises preparation of D-doped AB 1   1-y B 2   y X 3  perovskite nanocrystals, wherein B 1  comprises silver (Ag), sodium (Na) and potassium (K);
 B 2  comprises indium (In), bismuth (Bi) and antimony (Sb); and   y=0 to 1.